# US 2025/0146801 A1 · Tracer projectile sealing and ignition enhancement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146801 A1 - Document ID: US20250146801A1 - Status: Published application - Kind: A1 - Application number: 18/939,201 - Filed: 2024-11-06 - Published: 2025-05-08 - Earliest claimed: 2023-11-07 - Inventors: Harry Arnon; Howard D. Kent; Josef Arnon; Kyle Cassidy - Web page: https://patentgrep.com/patent/US20250146801A1 ## CPC - F42B 12/382: {emitting an electromagnetic radiation, e.g. laser beam or infrared emission} - F42B 12/38: of tracer type - F42B 33/02: Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges {(F42B33/004 takes precedence)} - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) ## Abstract A tracer projectile used in a tracer round for a firearm, the tracer projectile including a body having a forwardly directed tip, a rearwardly directed trailing end, and a cavity formed in the trailing end of the body with a rearwardly directed opening. A tracer composition is contained in the cavity. An igniter sealant overlies the tracer composition, closing and sealing the rearwardly directed opening of the cavity. The igniter sealant is a hardened layer protecting the underlying tracer composition, sealing the cavity from moisture ingress, and is flammable to ignite the underlying tracer composition. ## Claims ### Claim 1 A tracer projectile used in a tracer round for a firearm, the tracer projectile comprising: a body having a forwardly directed tip and a rearwardly directed trailing end; a cavity formed in the trailing end of the body with a rearwardly directed opening; a tracer composition contained in the cavity; and an igniter sealant overlying the tracer composition, closing and sealing the rearwardly directed opening of the cavity, the igniter sealant is a hardened layer protecting the underlying tracer composition, sealing the cavity from moisture ingress, and is flammable to ignite the underlying tracer composition. ### Claim 2 (depends on 1) The projectile as claimed in claim 1 wherein the igniter sealant comprises: an adhesive sealant; and a flammable additive. ### Claim 3 (depends on 2) The projectile as claimed in claim 2 wherein the adhesive sealant includes one of an epoxy, a urethane adhesive, and an acrylic adhesive. ### Claim 4 (depends on 1) The projectile as claimed in claim 1 wherein the igniter sealant comprises: an epoxy resin; a mercaptan hardener; and a flammable additive. ### Claim 5 (depends on 2) The projectile of claims 2 wherein the flammable additive includes at least one of a carbonaceous agent and a metallic agent. ### Claim 6 (depends on 5) The projectile of claims 5 wherein carbonaceous agent includes at least one of carbon black, nitrocellulose, nitrosamines, and hydrocarbons. ### Claim 7 (depends on 1) The projectile of claim 1 wherein the igniter sealant comprises: a first part having at least 60% by weight epoxy resin and 40% or less by weight flammable additive; and a second part having at least 60% hardener by weight and 40% or less flammable additive by weight. ### Claim 8 (depends on 1) The projectile as claimed in claim 1 wherein the body comprises a jacket having a forward end corresponding to the forward tip of the body and a rearward end corresponding to the trailing end of the body, a point filler filling the forward end of the jacket, and the cavity defined by the rearward end of the jacket and extending rearwardly from a base of the point filler to the rearwardly directed opening. ### Claim 9 A tracer projectile used in a tracer round for a firearm, the tracer projectile comprising: a body having a forwardly directed tip and a rearwardly directed trailing end; a cavity formed in the trailing end of the body with a rearwardly directed opening; a tracer composition contained in the cavity having a flat rearwardly directed surface; and an igniter sealant including an adhesive sealant, and a flammable additive, overlying the tracer composition, closing and sealing the rearwardly directed opening of the cavity, the igniter sealant is a hardened layer protecting the underlying tracer composition, sealing the cavity from moisture ingress, and is flammable to ignite the underlying tracer composition. ### Claim 10 (depends on 9) The projectile as claimed in claim 9 wherein the body comprises a jacket having a forward end corresponding to the forward tip of the body and a rearward end corresponding to the trailing end of the body, a point filler filling the forward end of the jacket, and the cavity defined by the rearward end of the jacket and extending rearwardly from a base of the point filler to the rearwardly directed opening. ### Claim 11 (depends on 9) The projectile of claims 9 wherein the flammable additive includes at least one of a carbonaceous agent and a metallic agent. ### Claim 12 (depends on 11) The projectile of claims 11 wherein carbonaceous agent includes at least one of carbon black, nitrocellulose, nitrosamines, and hydrocarbons. ### Claim 13 (depends on 9) The projectile of claim 9 wherein the igniter sealant comprises: a first part having at least 60% by weight epoxy resin and 40% or less by weight flammable additive; and the second part having at least 60% hardener by weight and 40% or less flammable additive by weight. ### Claim 14 (depends on 9) The projectile as claimed in claim 9 wherein the adhesive sealant includes one of an epoxy, a urethane adhesive, and an acrylic adhesive. ### Claim 15 A method of fabricating a tracer projectile comprising the steps of: providing a projectile body having a forward end and a trailing end; providing a cavity in the trailing end with a rearwardly directed opening; placing a tracing composition in the cavity, the tracing composition having a rearwardly facing surface; mixing a fluid igniter sealant including an adhesive sealant, and a flammable additive; depositing the fluid igniter sealant over the surface of the tracing composition and closing the rearwardly directed opening; and forming a hardened igniter sealant by curing the fluid igniter sealant, the hardened igniter sealant overlying the tracer composition, closing and sealing the rearwardly directed opening of the cavity, the hardened igniter sealant protecting the underlying tracer composition, sealing the cavity from moisture ingress, and being flammable to ignite the underlying tracer composition. ### Claim 16 (depends on 15) The method of claims 15 wherein the flammable additive includes at least one of a carbonaceous agent and a metallic agent. ### Claim 17 (depends on 16) The method of claims 16 wherein carbonaceous agent includes at least one of carbon black, nitrocellulose, nitrosamines, and hydrocarbons. ### Claim 18 (depends on 15) The method of claim 15 wherein the fluid igniter sealant comprises: a first part having at least 60% by weight epoxy resin and 40% or less by weight flammable additive; and a second part having at least 60% hardener by weight and 40% or less flammable additive by weight.